摘要
该文选用硫酸亚铁、亚硫酸钠和葡萄糖作为还原剂将Cr(Ⅵ)还原为Cr(Ⅲ),采用清洗和土培实验考察铬污染稳定化效果。结果表明,硫酸亚铁有较好的稳定化效果,清洗和土培还原方式下最大去除率分别达到83.8%和91.1%,土培方式优于清洗。在此基础上,以硫酸亚铁为还原药剂,采用SEM-EDS、XRD和FTIR等表征手段分析确定六价铬转化机理,通过实验优化,确定最优投加量(n[Fe(Ⅱ)]∶n[Cr(Ⅵ)]=10∶1)和时间(18 d),并进行工程化应用,处理后降低到《土壤环境质量建设用地土壤污染风险管控标准(试行)》(GB 36600-2018)中第一类用地的筛选值3.0 mg/kg以下。
Ferrous sulfate,sodium sulfite,and glucose were used as reducing agents to reduce Cr(Ⅵ)to Cr(Ⅲ).The stabilization effect of chromium pollution was investigated by washing and soil cultivating reduction methods.The results showed that ferrous sulfate had better stabilization effect,and the maximum removal efficiency of washing and soil cultivating reduction could reach 83.8%and 91.1%,respectively.On this basis,ferrous sulfate was used as reducing agent,and the transformation mechanism of hexavalent chromium was analyzed and determined by SEM-EDS,XRD and FTIR.The optimal dosage(n[Fe(Ⅱ)]∶n[Cr(Ⅵ)]=10∶1)and time(18 days)were determined through optimizing experiments,and the engineering application was carried out.After treatment,it was lowered to below 3.0 mg/kg of filter value of ClassⅠland in Soil Environmental Quality Risk Control Standard for Soil Contamination of Development Land(Trial)(GB 36600-2018).
作者
邱沙
宋景鹏
陈志国
白鹤
曹文庆
刘艺芸
QIU Sha;SONG Jingpeng;CHEN Zhiguo;BAI He;CAO Wenqing;LIU Yiyun(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;Tianjin Huakan Environmental Protection Technology Co.Ltd.,Tianjin 300170,China;Tianjin North China Geological Exploration Bureau,Tianjin 300170,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2021年第4期131-139,共9页
Environmental Science & Technology
基金
天津市科技计划项目(20YFZCSN00650)。
关键词
六价铬
化学还原
原位
土壤
工程应用
hexavalent chromium
chemical reduction
in situ
soil
engineering application
